建立了非线性化学指纹图谱法测定啤酒中乙醇的方法.取4份5mL啤酒标样,分别加入0,1,2和4 mL5％的乙醇,再分别加入20 mL 1 mol/L H2SO4、4 mL 1.25 mol/L丙二酸、3 mL 0.1 mol/L硫酸铈铵,以水定容至52 mL.在37.0℃,850 r/min反应条件下,...建立了非线性化学指纹图谱法测定啤酒中乙醇的方法.取4份5mL啤酒标样,分别加入0,1,2和4 mL5％的乙醇,再分别加入20 mL 1 mol/L H2SO4、4 mL 1.25 mol/L丙二酸、3 mL 0.1 mol/L硫酸铈铵,以水定容至52 mL.在37.0℃,850 r/min反应条件下,恒速搅拌4 min,快速注入8 mL 0.8 mol/L NaBrO3,记录非线性化学指纹图谱.利用其最大波幅和乙醇含量拟合得出线性回归方程,用于测定其它啤酒中乙醇的含量.结果表明,在一定的浓度范围内,乙醇的浓度与最大波幅值线性关系良好,相关系数R为0.9989～0.9996,样品加标回收率为97.1％ ～ 102.0％,RSD为0.4％～1.7％.本方法快速、简便、重现性好、精密度高,是一种切实可行的测定啤酒乙醇含量的新方法,也可为复杂样品中其它成分的测定提供借鉴手段.展开更多
Fingerprints of two varieties of rice and their mixtures were investigated by a nonlinear chemical reaction system consisting of rice components,sodium bromate,manganese sulfate,sulfuric acid and acetone.The variety o...Fingerprints of two varieties of rice and their mixtures were investigated by a nonlinear chemical reaction system consisting of rice components,sodium bromate,manganese sulfate,sulfuric acid and acetone.The variety of rice was identified by the visual characteristic of fingerprint and system similarity pattern recognition,and the content of each variety of rice in the mixture was determined by the quantitative information of fingerprint.The results show that nonlinear chemical analysis may be used to exactly identify the variety of pure rice and to accurately determine the content of each variety of rice in the mixture,indicating the method is simple and convenient.展开更多
基金Project(61533021) supported by the National Natural Science Foundation of China
文摘Fingerprints of two varieties of rice and their mixtures were investigated by a nonlinear chemical reaction system consisting of rice components,sodium bromate,manganese sulfate,sulfuric acid and acetone.The variety of rice was identified by the visual characteristic of fingerprint and system similarity pattern recognition,and the content of each variety of rice in the mixture was determined by the quantitative information of fingerprint.The results show that nonlinear chemical analysis may be used to exactly identify the variety of pure rice and to accurately determine the content of each variety of rice in the mixture,indicating the method is simple and convenient.
